| ATOMIC AND MOLECULAR PHYSICS |
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Whispering Gallery Mode Lasing Performance's Evolution of Floating GaN Microdisks Varying with Their Thickness |
| Gangyi Zhu1*, Mufei Tian1, M. Almokhtar2, Feifei Qin1, Binghui Li3, Mengyao Zhou1, Fei Gao1, Ying Yang1, Xin Ji1, Siqing He1, and Yongjin Wang1 |
1GaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province, College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
2Physics Department, Assiut University, Assiut 71516, Egypt
3State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
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Gangyi Zhu, Mufei Tian, M. Almokhtar et al 2022 Chin. Phys. Lett. 39 123401 |
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Abstract Optical gain and loss of microcavity greatly affect the quality of lasing, how to improve optical gain and decrease optical loss is of great significance for the preparation of laser. In this study, four types standard microdisks with different thicknesses of 2.2 µm, 1.9 µm, 1.7 µm, and 1.45 µm were fabricated by micromachining technology process to modulate optical gain and loss of microdisk lasing. The whispering gallery mode lasing in the ultraviolet range of GaN microdisk devices was investigated for these devices in order to clarify the effect of microdisk thickness on device characteristics. The quality factor $Q$ and lasing mode number for different thicknesses are calculated from the stimulated spectra. The lifetimes of the exciton combination properties of the devices were observed using time-resolved PL spectroscopy. The lasing modes are modulated, and the lifetime decreases, while the $Q$ factor of the devices first increases and then decreases with decreasing thickness. All these results are induced by optical gain and loss competition.
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Received: 29 September 2022
Published: 22 November 2022
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